On Fri, Jun 1, 2012 at 3:24 PM, Alex Rønne Petersen <a...@lycus.org> wrote:
> On 01-06-2012 23:05, Matthew Caron wrote: > >> Hey folks, >> >> So, I've used the instructions and code here: >> >> https://bitbucket.org/goshawk/**gdc/wiki/crosstool-ng<https://bitbucket.org/goshawk/gdc/wiki/crosstool-ng> >> >> to build a gdc for ARM. >> >> I've written up a simple "Hello world" and I get an Illegal Instruction >> when executing on my ARM Linux EABI system. >> >> GDB says (edited to remove standard stuff): >> >> == >> (gdb) run >> Starting program: /hello >> >> Program received signal SIGILL, Illegal instruction. >> 0x0002f5c4 in _D2gc3gcx2GC6mallocMFkkPkZPv (this=@0x96018, size=88, >> bits=1, >> alloc_size=0x0) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gcx.d:1224 >> >> 1224 >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**libphobos/gc/gcx.d: >> No >> such file or directory. >> in /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gcx.d >> Current language: auto; currently minimal >> (gdb) bt full >> #0 0x0002f5c4 in _D2gc3gcx2GC6mallocMFkkPkZPv (this=@0x96018, size=88, >> bits=1, alloc_size=0x0) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gcx.d:1224 >> >> No locals. >> #1 0x0002692c in gc.gc.gc_malloc (sz=<value optimized out>, >> ba=<value optimized out>) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gc.d:201 >> No locals. >> #2 0x00019ad0 in _d_newclass (ci=@0x8e8bc) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/rt/lifetime.d:123 >> >> p = Unhandled dwarf expression opcode 0x9f >> == >> >> So, the error is at line 1224 of gcx.d, which is: >> >> == >> /** >> * add range to scan for roots >> */ >> void addRange(void *p, size_t sz) >> { >> if (!p || !sz) // 1224 >> { >> return; >> } >> == >> >> The full backtrace is less than useful here, because of optimizations in >> libphobos, so I've recompiled libphobos with -O0. Recompiling my program >> and re-running it gives me: >> >> == >> (gdb) run >> Starting program: /hello >> Hello gents >> >> Program received signal SIGILL, Illegal instruction. >> 0x0004535c in _**D2gc3gcx3Gcx16fullcollectshell**MFZk (this=Cannot access >> memory at address 0x1 >> ) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gcx.d:245 >> >> 245 >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**libphobos/gc/gcx.d: >> No >> such file or directory. >> in /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gcx.d >> Current language: auto; currently minimal >> (gdb) bt full >> #0 0x0004535c in _**D2gc3gcx3Gcx16fullcollectshell**MFZk (this=Cannot >> access >> memory at address 0x1 >> ) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gcx.d:245 >> >> No locals. >> #1 0x000418ec in _**D2gc3gcx2GC18fullCollectNoStac**kMFZv (this=@0xe4018) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gcx.d:245 >> >> __sync33 = (struct TypeInfo_Class &) @0xdce4c: {init = {length = 8, >> ptr = 0xbc81c "4�v"}, name = {length = 13, >> ptr = 0xbc824 "gc.gcx.GCLock"}, vtbl = {length = 6, ptr = 0xbc834}, >> interfaces = {length = 0, ptr = 0x0}, base = @0xda804, destructor = 0x0, >> classInvariant = 0, m_flags = 54, deallocator = 0x0, m_offTi = {length = >> 0, >> ptr = 0x0}, defaultConstructor = 0x0, xgetMembers = 0} >> #2 0x0003ca34 in gc_term () >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/gc/gc.d:133 >> No locals. >> #3 0x00022e2c in rt.dmain2.main.runAll (this=0xbe9e7cd8) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/rt/dmain2.d:67 >> >> No locals. >> #4 0x000227c4 in rt.dmain2.main.tryExec (this=0xbe9e7cd8, dg= >> {object = 0xbe9e7cd8, func = 0x22d94 <rt.dmain2.main.runAll>}) >> ---Type <return> to continue, or q <return> to quit--- >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/rt/dmain2.d:67 >> >> No locals. >> #5 0x000225ac in main (argc=1, argv=0xbe9e7e64) >> at >> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/** >> libphobos/rt/dmain2.d:67 >> >> trapExceptions = true >> am = (struct char[] *) 0xe4008 >> result = 0 >> args = {length = 1, ptr = 0xe4008} >> == >> >> This actually does print the "Hello gents" that it is supposed to, but >> then dies after (likely when exiting and collecting all its memory). >> >> The line referenced is in the following: >> == >> {{{ >> void initialize() // 245 >> { >> gcLock = GCLock.classinfo; >> gcx = cast(Gcx*)cstdlib.calloc(1, Gcx.sizeof); >> if (!gcx) >> onOutOfMemoryError(); >> gcx.initialize(); >> setStackBottom(rt_stackBottom(**)); >> } >> }}} >> >> I should note that I tested the gcc which was built along with gdc and >> it does produce a "Hello world" application which appears to work >> correctly. >> >> Does anyone have any ideas/pointers/hey there, do it this way, dummy/etc? >> > > Please try building libphobos and libdruntime with -fno-section-anchors. > > You certainly need to do this, but -O0 means that section-anchors optimization is turned off anyway, so that isn't actually your problem. Can you run `disassemble` in gdb to see what the faulting instruction is?
